vold: Honor mount options for ext4/f2fs partitions

vold: Honor mount options for ext4/f2fs partitions

 * Save mount options and fstype for DiskPartition objects
 * Pass mount options and fstype to PublicVolume ctor
 * Pass mount options to ext4::Mount/f2fs:Mount
 * Use specified/default fstype if blkid fails

This is trivially extensible for other fs types.

[mikeioannina] Adapt for Pie
[cwhuang] Adapt for Android Q

Change-Id: Ie5dd27f26a4a7129dd9efe6a7ad0a589928282a0